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![[Post New]](/templates/default/images/icon_minipost_new.gif) 13 Sep 2007 19:23:45 IST
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rolling ball strikes a vertical wall.....floor is having friction.discuss the possible cases ....bef colli...after colli...etc
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om namoh narayana.....
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23 Sep 2007 21:05:46 IST
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be more specific.....
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Heights by great men reached and kept,
were not attained in a sudden flight
but, they, while their companions slept
were toiling upwards in the night. |
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23 Sep 2007 22:54:32 IST
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angular velocity will not change because the normal rxn. due to wall acts through the center.....so its velocity is just reversed(if the collision is elastic)
so there is kinetic friction in a direction which will be decided by the values of speed and angular velocity...
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24 Sep 2007 09:25:10 IST
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u mean if a ball is rolling clockwise if it gets banged with d wall...the ball starts rotating anticlocwise?
if there is 0 fricton....along the wall ....no torque (by frict) by d wall what now should i consider...
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om namoh narayana.....
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24 Sep 2007 18:12:00 IST
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friction of wall wl not b considered as there is no motion in y direction..only x(horizntl.)
the impulse of d wall will change the velocity nd then the frictino of the ground will cause it to rotate...
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Heights by great men reached and kept,
were not attained in a sudden flight
but, they, while their companions slept
were toiling upwards in the night. |
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24 Sep 2007 18:44:12 IST
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ya well but when the ball strikes the wall visualize that moment...arrent u able 2 make out that friction is along the wallis in upwards dir if the rolling ball (if moving in clockwise dir....)
please yaar draw few of d diagrams,...
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om namoh narayana.....
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24 Sep 2007 18:47:09 IST
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what abt if the floor is frictionless?
ok tell me 1 thing ..is .rotation possible on a frictionless surface or not...?????
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om namoh narayana.....
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24 Sep 2007 19:13:00 IST
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for rolling motion to initiate, a frictional surface is required. but after that it can continue rollling onto a frictionless surface, provided it is horizontal
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---------------------------------------------------------------
* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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as we are talkin about a perfectly elastic collision, it just touches the wall at one point with an impulse and turns back in the opp. direction, the friction of wall doesnt matter here.
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---------------------------------------------------------------
* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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25 Sep 2007 21:40:01 IST
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I wrote about the case when the wall is frictionless....
i.e. no torque because N passes through center....
and rolling is possible on a frictionless surface....
u place a rolling ball gently on frictionless floor..then it will just stay there and roll ....with slipping on ground....
but if u give it some initial velocity....and v=wr...then it will roll WITHOUT slipping....
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25 Sep 2007 23:22:39 IST
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@ spidey its perfectly fine tat it changes its dir ....but why?
what caused this turning?
d III ans of neeraj bit satisfies mut not vry much can anybody b sum wat more specific....
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om namoh narayana.....
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25 Sep 2007 23:26:28 IST
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conservation of momentum
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---------------------------------------------------------------
* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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26 Sep 2007 17:21:17 IST
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anil_kapoor....
can u be somewhat specific about the situation u want to discuss about....
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26 Sep 2007 17:41:37 IST
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well i m tryin 2 pst a digram ...but that'snt getting uploaded ...!
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om namoh narayana.....
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26 Sep 2007 17:46:43 IST
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if ur drawing the diagram in ms paint. save the file as.jpeg not .bmp in the file type option
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---------------------------------------------------------------
* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighb |
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